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class 8 questions..
Answers
a. Pumonary artery: Deoxygenated blood, Pulmonary vein: Oxygenated blood
b. Artery: Away from heart, Vein: towards the heart
c. Closed: Presence of well defined blood vessels Open: Absense of blood vessles
Answer:
Difference between pulmonary artery and pulmonary vein on the basis of kind of blood
pulmonary artery
it carry oxygeneted blood from the heart to the lungs
pulmonary vein
it carry deoxygeneted blood from the body parts to the heart
Difference between arteries and veins on the basis of direction if blood flow
Arteries
arteries carry the blood from the heart to different tissues of body
veins
veins carry blood from different tissues of the body back to the heart
Definition of closed vascular system
vascular system is also called as circulatory system .closed vascular system found in all vertebrates and in some invertebrates.it circulates the blood unidirectionally from the heart around the body and then back to heart
Defintion of open vascular system
open vascular system s found in arthropods , pumps blood into a cavity called a homocoel where it surrounds the organism and then returns to the heart through ostia ( openings)